We know that the Black Sea, one thousand years ago, was a fresh water lake about ________ and unconnected with the Mediterranean.
A. its two thirds present size B. two-thirds size of the present
C. its two-thirds of the present size D. two- thirds its present size
— I’m sorry to hear that some villagers got disabled in the earthquake.
— That’s too bad, but _______.
A. all is well that ends well B. the darkest hour is nearest the dawn
C. where there is life, there is hope D. it is good to have friends in trouble
The Yangtze River, China's longest, has been affected by a severe drought, ________ the lowest level of rainfall this year since 1961．
A．with B．for C．beyond D．besides[来
Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
A. work B. working C. is working D. are working
There was so serious a matter that I had no choice but _________ the police.
A. called in B. calling on C. call for D. to call in
The new research team was led by the ________engineer.
A. main B. major C. chief D. primary
